Check valve



March 17, 1959 J. POMMIER CHECK VALVE Filed March 28, 1957 Fig./

INVENTOR. 402 34.

Leonel J. Pomm/er CHECK VALVE Leonel J. Pommier, Bourbonnais, Ill.

Application March 28, 1957, Serial N 0. 649,055

1 Claim. (Cl. 137514.7)

The present invention relates to new and useful improvements in checkvalves for use particularly in the delivery lines of pumps and has forits primary object to provide, in a manner as hereinafter set forth, adevice of this character comprising novel means, operable by the wateror other fluid pressure, for instantly closing the valve when the pumpstops.

Other objects of the invention are to provide a check valve of theaforementioned character which will be comparatively simple inconstruction, strong, durable, compact, highly efficient and reliable inoperation and which may be manufactured at low cost.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure 1 is a view in vertical longitudinal section through a checkvalve constructed in accordance with the present invention; and

Figure 2 is a view in horizontal section, taken substantially on theline 2--2 of Figure 1.

Referring now to the drawing in detail, it will be seen that theembodiment of the invention which has been illustrated comprises a bodyof suitable metal which is designated generally by reference character3. The body 3 is interposed in the delivery line 4 from a pump and saidbody comprises an inlet 5 and an outlet 6. The body 3 further comprisesa partition 7 having formed therein a port or opening formed to providea seat 8.

Rising from the body 3 and communicating therewith on the outlet side ofthe partition 7 is a cylinder or cham her 9 which is aligned with theseat 8. The top of the cylinder 9 is closed by a removable cover 10. Awater tube or pipe 11 has one end connected to the cover and its otherend connected to the delivery line 4 on the outlet side of the body 3.

Mounted for reciprocation in the cylinder 9 is a substantiallycup-shaped plunger or piston 12 the bottom 13 of which is provided witha plurality of perforations 14. Depending from the bottom 13 of thepiston 12 is a valve member 15 of the poppet type which is engageablewith the seat 8. A coil. spring 16 is mounted under compression in thecylinder 9 and the piston 12 for yieldingly urging the valve member 15toward the seat 8.

It is thought that the operation of the invention will be readilyapparent from a consideration of the foregoing. Briefly, when the pumpis operating water therefrom, as indicated by the arrows in Figure 1 ofthe drawing, enters the body 3 at 5, raises the valve 15 to openposition against the tension of the coil spring 16 as it passes throughthe seat or opening 8 and is discharged from said body at 6. The pipe ortube 11 discharges water under pressure from the line 4 on the outletside of the check ited States Patent 0 valve into the cylinder 9 and thesubstantially cup-shaped piston 12. Thus, when the stops and thepressure drops on the intake side of the check valve, the water pressurein the cylinder 9, with the assistance of the coil spring 16, forcessaid piston downwardly for engaging the valve member 15 with the seat 8in an obvious manner for preventing the back flow of said water. Theconstruction and arrangement is such as to prevent movement of the valvemember 15 with the pulsations of the pump thereby insuring quietoperation.

The perforations 14 permit the water to drain from the piston 14 and thecylinder 9.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction and operation shown anddescribed, and accordingly all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention asclaimed.

What is claimed as new is as follows:

A check valve comprising a hollow valve body for interposition in a pumpdelivery line and having inlet and outlet sides, a partition in saidbody having an opening therein for passage of liquid from said inlet tosaid outlet side, a cylinder of a uniform internal diameter integralwith said body and having free communication at one end with the outletside of said body, the other end of said cylinder being open and leavingan outturned laterally projecting flange, a flat plate closing said openend and having fasteners detachably connecting it to said flangeoutwardly of said cylinder, an elongated hollow piston of uniformexternal diameter slidable in said cylinder through said cylinder endopening into said outlet side of said valve body and movable toward andaway from said opening, said piston having the major portion of itslength received and guided at all times in said cylinder, said pistonhaving a flat bottom wall and being open at its top into said cylinder,a helical spring in said cylinder and piston bearing against said plateand said bottom wall and yieldingly urging said piston towards saidopening, said bottom wall having an integral valve stem dependingtherefrom towards said opening and a valve integral with said stem andspaced from said bottom wall to close said opening in response tomovement of said piston towards said opening and being movable outwardlyof said opening under liquid pressure in the inlet side of the body forpassage of liquid through the opening, a pipe connecting the line on theoutlet side of said body to said other end of said cylinder through saidplate for introducing liquid under pressure to said piston to supplementsaid spring in moving said piston, said bottom wall having restricteddownwardly opening drain passages therethrough for draining liquidaccumulating in the interior of said piston,

I said plate having the plural functions of constituting a stop meansengaged by said piston for limiting movement of the latter from saidopening, a retainer for said spring, a closure for said cylinder and aconnection for said pipe and cylinder.

References Cited in the file of this patent UNITED STATES PATENTS1,631,142 Masters June 7, 1927 2,665,877 MacGregor Jan. 12, 19542,675,172 Anderson Apr. 13, 1954 2,678,057 Ifield May 11, 1954 2,724,239Fox Nov. 22, 1955

